Types of TV Antenna

Antennas are the means for combining the transmitter to the medium, during this case, free space. An antenna is an electromagnetic radiator. It creates an electromagnetic field. And proceeds out from the transferring antenna to the receiver’s antenna, which then converts the nonparticulate radiation into electrical signals that are applied to the receiver’s input stages.

There are several types of antennas.

• Omni-Directional Antennas

  generate all told directions. Read about the best omni directional antenna.

• semi-directional antennas generate in very constricted fashion, defined by a selected angle.
• Directional antennas have a narrow “beam” that permits highly directional generate. And familiar types are the parabolic and Yagi. Each has different characteristics and applications.

Dipole Antennas, Rubber Ducky:

Dipole antennas are the common form of antenna used and are Omni-directional. The propagating frequency (RF) energy 360 degrees within the horizontal plane. These devices are constructed to be low at a half or quarter wavelength of the frequency is applied. This antenna is commonly as simple as two pieces of wire move the correct length. This configuration is sometimes mentioned as a “rubber ducky” antenna. The dipole is used in many enterprises. It also used tiny office and residential office (SOHO) Wi-Fi deployments.

An antenna exhibits a typical impedance, allowing the matching of the antenna to the transmitter for max power transfer. If the antenna and transmitter do not seem to be matched, reflections will occur on the cable. which may degrade the signal or even damage the transmitter. These reflections are described by the term standing wave ratio (SWR) and indicate the efficiency of the cable. SWR of 1:1 would indicate that no power is reflected and lost. 5:1 would indicate a reflection and loss of 44%. SWR is typically used as a voltage ratio and mentioned as VSWR.

Sector Antenna:

Sector antennas are another form of semi-directional antenna. Sector antennas provide a pie-shaped graphical record. It usually installed in what’s stated as a sectorized array. Beamwidth for a sector antenna is often between 60 and 180 degrees, with 120 degrees being typical. During a sectorized array, antennas are mounted back-to-back to provide full 360-degree coverage. Sector antennas are used extensively for cellular communications.

Yagi Antenna:

A commonly used antenna is that the Yagi-Uda Array, usually just called a Yagi. It had been invented by Shintaro Uda and his colleague, Hidetsugu Yagi, in 1926. A Yagi antenna uses several elements to form a directional array. One driven element, typically a dipole, generates RF energy. And the elements placed immediately before and behind the driven element re-radiate RF energy in phase and out of phase. which enhancing and retarding the signal, respectively. The weather is called parasitic elements. The element behind the driven element has named the reflector. while the weather before the driven element is termed directors. Yagi antennas have beamwidths within the range of 30 to 80 degrees and may provide well in more than 10 dBi passive gain.